protected override void Paint(Graphics graphics, Rectangle clipBounds, Rectangle cellBounds, int rowIndex, DataGridViewElementStates cellState, object value, object formattedValue, string errorText, DataGridViewCellStyle cellStyle, DataGridViewAdvancedBorderStyle advancedBorderStyle, DataGridViewPaintParts paintParts) { TreeGridNode node = this.OwningNode; if (node == null) { return; } Image image = node.Image; if (this._imageHeight == 0 && image != null) { this.UpdateStyle(); } // paint the cell normally base.Paint(graphics, clipBounds, cellBounds, rowIndex, cellState, value, formattedValue, errorText, cellStyle, advancedBorderStyle, paintParts); // TODO: Indent width needs to take image size into account Rectangle glyphRect = new Rectangle(cellBounds.X + this.GlyphMargin, cellBounds.Y, INDENT_WIDTH, cellBounds.Height - 1); int glyphHalf = glyphRect.Width / 2; //TODO: This painting code needs to be rehashed to be cleaner int level = this.Level; //TODO: Rehash this to take different Imagelayouts into account. This will speed up drawing // for images of the same size (ImageLayout.None) if (image != null) { Point pp; if (_imageHeight > cellBounds.Height) { pp = new Point(glyphRect.X + this.glyphWidth, cellBounds.Y + _imageHeightOffset); } else { pp = new Point(glyphRect.X + this.glyphWidth, (cellBounds.Height / 2 - _imageHeight / 2) + cellBounds.Y); } // Graphics container to push/pop changes. This enables us to set clipping when painting // the cell's image -- keeps it from bleeding outsize of cells. System.Drawing.Drawing2D.GraphicsContainer gc = graphics.BeginContainer(); { graphics.SetClip(cellBounds); graphics.DrawImageUnscaled(image, pp); } graphics.EndContainer(gc); } // Paint tree lines if (node._grid.ShowLines) { using (Pen linePen = new Pen(SystemBrushes.ControlDark, 1.0f)) { linePen.DashStyle = System.Drawing.Drawing2D.DashStyle.Dot; bool isLastSibling = node.IsLastSibling; bool isFirstSibling = node.IsFirstSibling; if (node.Level == 1) { // the Root nodes display their lines differently if (isFirstSibling && isLastSibling) { // only node, both first and last. Just draw horizontal line graphics.DrawLine(linePen, glyphRect.X + 4, cellBounds.Top + cellBounds.Height / 2, glyphRect.Right, cellBounds.Top + cellBounds.Height / 2); } else if (isLastSibling) { // last sibling doesn't draw the line extended below. Paint horizontal then vertical graphics.DrawLine(linePen, glyphRect.X + 4, cellBounds.Top + cellBounds.Height / 2, glyphRect.Right, cellBounds.Top + cellBounds.Height / 2); graphics.DrawLine(linePen, glyphRect.X + 4, cellBounds.Top, glyphRect.X + 4, cellBounds.Top + cellBounds.Height / 2); } else if (isFirstSibling) { // first sibling doesn't draw the line extended above. Paint horizontal then vertical graphics.DrawLine(linePen, glyphRect.X + 4, cellBounds.Top + cellBounds.Height / 2, glyphRect.Right, cellBounds.Top + cellBounds.Height / 2); graphics.DrawLine(linePen, glyphRect.X + 4, cellBounds.Top + cellBounds.Height / 2, glyphRect.X + 4, cellBounds.Bottom); } else { // normal drawing draws extended from top to bottom. Paint horizontal then vertical graphics.DrawLine(linePen, glyphRect.X + 4, cellBounds.Top + cellBounds.Height / 2, glyphRect.Right, cellBounds.Top + cellBounds.Height / 2); graphics.DrawLine(linePen, glyphRect.X + 4, cellBounds.Top, glyphRect.X + 4, cellBounds.Bottom); } } else { if (isLastSibling) { // last sibling doesn't draw the line extended below. Paint horizontal then vertical graphics.DrawLine(linePen, glyphRect.X + 4, cellBounds.Top + cellBounds.Height / 2, glyphRect.Right, cellBounds.Top + cellBounds.Height / 2); graphics.DrawLine(linePen, glyphRect.X + 4, cellBounds.Top, glyphRect.X + 4, cellBounds.Top + cellBounds.Height / 2); } else { // normal drawing draws extended from top to bottom. Paint horizontal then vertical graphics.DrawLine(linePen, glyphRect.X + 4, cellBounds.Top + cellBounds.Height / 2, glyphRect.Right, cellBounds.Top + cellBounds.Height / 2); graphics.DrawLine(linePen, glyphRect.X + 4, cellBounds.Top, glyphRect.X + 4, cellBounds.Bottom); } // paint lines of previous levels to the root TreeGridNode previousNode = node.Parent; int horizontalStop = (glyphRect.X + 4) - INDENT_WIDTH; while (!previousNode.IsRoot) { if (previousNode.HasChildren && !previousNode.IsLastSibling) { // paint vertical line graphics.DrawLine(linePen, horizontalStop, cellBounds.Top, horizontalStop, cellBounds.Bottom); } previousNode = previousNode.Parent; horizontalStop = horizontalStop - INDENT_WIDTH; } } } } if (node.HasChildren || node._grid.VirtualNodes) { try { // Paint node glyphs if (node.IsExpanded) { node._grid.rOpen.DrawBackground(graphics, new Rectangle(glyphRect.X, glyphRect.Y + (glyphRect.Height / 2) - 4, 10, 10)); } else { node._grid.rClosed.DrawBackground(graphics, new Rectangle(glyphRect.X, glyphRect.Y + (glyphRect.Height / 2) - 4, 10, 10)); } } catch { } } }